This is a simple 555-based high voltage inverter circuit. The high voltage DC to DC converter is suitable for small current (a few mA) but requiring high voltage electronics. For example Nixiu display, VFD, or a other vacuum tube circuit. We will use a tube guitar pre-amplifier.
The C3 capacitor high voltage type! Min 250V.
DC to DC converter test
They built a little deviated from the circuit. Instead there 100uH inductor, 150uH toroidal coil. UF4004 diode instead of FR107, but also meets other similar fast diode. As you can see in the picture, the 9V battery voltage of 105V voltage is converted.
Test results :
In 12v 120mA
Out 105V 1mA
This is perfect for us now a tube guitar preamp circuit.